<template>
  <div>   <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>

    </el-breadcrumb>

    <el-card>
      <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" show-icon>
      </el-alert>

      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <el-cascader v-model="selectedCateKeys" expandTrigger="hover" clearable :options="catelist" :props="cateProps"
                       @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <!--标签-->
      <el-tabs v-model="activeName" @tab-click="handleClick">
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数
          </el-button>
          <!-- 动态参数-->
          <el-table :data="manyTableData" border>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag closable v-for="(item, i) in scope.row.attr_vals" :key="i" @close="handleClose(i, scope.row)">
                  {{item}}
                </el-tag>
                <!--                添加标签的框-->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                          v-model="scope.row.inputValue"
                          ref="saveTagInput" size="small"
                          @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)"></el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column prop="attr_name" label="参数名称"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini"
                           @click="showEditDialog(scope.row.attr_id)">编辑
                </el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>

            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态参数" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性
          </el-button>
          <!-- 静态参数-->
          <el-table :data="onlyTableData" border style="width: 100%">
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag closable v-for="(item, i) in scope.row.attr_vals" :key="i" @close="handleClose(i, scope.row)">
                  {{item}}
                </el-tag>
                <!--                添加标签的框-->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                          v-model="scope.row.inputValue"
                          ref="saveTagInput" size="small"
                          @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)"></el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column prop="attr_name" label="参数名称" width="180"></el-table-column>
            <el-table-column label="操作" width="250px">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini"
                           @click="showEditDialog(scope.row.attr_id)">编辑
                </el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--添加参数对话框-->
    <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
    </el-dialog>
    <!--修改参数对话框-->
    <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button size="mini" @click="editDialogVisible = false">取 消</el-button>
    <el-button size="mini" type="primary" @click="editParams">确 定</el-button>
  </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    name: 'Params',
    data() {
      return {
        addForm: {
          attr_name: ''
        },
        editForm: {
          attr_name: ''
        },
        addDialogVisible: false,
        editDialogVisible: false,
        manyTableData: [],
        onlyTableData: [],
        activeName: 'many',
        // 级联选择框双向绑定到的数组
        selectedCateKeys: [],
        // 商品分类列表
        catelist: [],
        // 级联选择框的配置对象
        cateProps: {
          value: 'cat_id',
          label: 'cat_name',
          children: 'children'
        },
        addFormRules: {
          attr_name: [
            { required: true, message: '请输入参数名称', trigger: 'blur' }
          ]
        },
        editFormRules: {
          attr_name: [
            { required: true, message: '请输入参数名称', trigger: 'blur' }
          ]
        }
      }
    },
    computed: {
      titleText() {
        if (this.activeName === 'many') {
          return '动态参数'
        } else {
          return '静态属性'
        }
      },

      isBtnDisabled() {
        if (this.selectedCateKeys.length !== 3) {
          return true
        } else {
          return false
        }
      },
      cateId() {
        if (this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        } else {
          return null
        }
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      // 删除对应的参数可选项
      handleClose(i, row) {
        row.attr_vals.splice(i, 1)
        this.saveAttrVals(row)
      },
      showInput(row) {
        row.inputVisible = true
        // 让文本框自动获得焦点
        // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
      },
      // 文本框失去焦点
      handleInputConfirm(row) {
        if (row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisible = false
          return
        }
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        // 需要发起请求，保存这次操作
        this.saveAttrVals(row)
      },
      // 将对 attr_vals 的操作，保存到数据库
      async saveAttrVals(row) {
        // 需要发起请求，保存这次操作
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${row.attr_id}`,
          {
            attr_name: row.attr_name,
            attr_sel: row.attr_sel,
            attr_vals: row.attr_vals.join(' ')
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('修改参数项失败！')
        }

        this.$message.success('修改参数项成功！')
      },
      // 根据Id删除对应的参数项
      async removeParams(attr_id) {
        const confirmResult = await this.$confirm(
          '此操作将永久删除该参数, 是否继续?',
          '提示',
          {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }
        ).catch(err => err)

        // 用户取消了删除的操作
        if (confirmResult !== 'confirm') {
          return this.$message.info('已取消删除！')
        }

        // 删除的业务逻辑
        const { data: res } = await this.$http.delete(
          `categories/${this.cateId}/attributes/${attr_id}`
        )

        if (res.meta.status !== 200) {
          return this.$message.error('删除参数失败！')
        }

        this.$message.success('删除参数成功！')
        this.getParamsData()
      }
      ,
      // 点击按钮，展示修改的对话框
      async showEditDialog(attr_id) {
        // 查询当前参数的信息
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes/${attr_id}`,
          {
            params: { attr_sel: this.activeName }
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取参数信息失败！')
        }

        this.editForm = res.data
        this.editDialogVisible = true
      }
      ,
      // 点击按钮，修改参数
      // 点击按钮，修改参数信息
      editParams() {
        this.$refs.editFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.put(
            `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
            { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
          )

          if (res.meta.status !== 200) {
            return this.$message.error('修改参数失败！')
          }
          this.$message.success('修改参数成功！')
          this.getParamsData()
          this.editDialogVisible = false
        })
      }
      ,
      // 点击按钮，添加参数
      addParams() {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.post(
            `categories/${this.cateId}/attributes`,
            {
              attr_name: this.addForm.attr_name,
              attr_sel: this.activeName
            }
          )

          if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败！')
          }

          this.$message.success('添加参数成功！')
          this.addDialogVisible = false
          this.getParamsData()
        })
      }
      ,
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      }
      ,
      // 重置修改的表单
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      }
      ,
      // tab切换
      handleClick() {
        console.log(this.activeName)
        this.getParamsData()
      }
      ,
      // 级联选择框选中项变化，会触发这个函数
      handleChange() {
        this.getParamsData()
      }
      ,
      // 获取参数的列表数据
      async getParamsData() {
        // 证明选中的不是三级分类
        if (this.selectedCateKeys.length !== 3) {
          this.selectedCateKeys = []
          this.manyTableData = []
          this.onlyTableData = []
          return
        }
        // 证明选中的是三级分类
        console.log(this.selectedCateKeys)
        // 根据所选分类的Id，和当前所处的面板，获取对应的参数
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: this.activeName }
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败！')
        }

        // console.log(res.data)
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          // 控制文本框的显示与隐藏
          item.inputVisible = false
          // 文本框中输入的值
          item.inputValue = ''
        })
        console.log(res.data)
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      }
      ,
      // 获取所有的商品分类列表
      async getCateList() {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类失败！')
        }
        this.catelist = res.data
        console.log(this.catelist)
      }
    }
  }
</script>

<style scoped>
  .cat_opt {
    margin: 15px 0;
  }

  .input-new-tag {
    width: 90px;
    margin-left: 10px;
    vertical-align: bottom;
  }

  .el-tag {
    margin: 10px;
  }
</style>
